[PATCH v3 mptcp-next 0/3] mptcp: misc improvement

[Paolo Abeni <pabeni@redhat.com>]

This series is a follow-up the discussion ongoing here:

https://github.com/multipath-tcp/mptcp_net-next/issues/437

Daire reported several sub-optimal MPTCP behaviour on high-latency
links.

At least 3 different items stands off:

* notsent_lowat setting fooling the scheduler
* sub-optimal send buffer autotuning
* delayed acks being de-facto disabled due to subflow rcvlowat

This series is an initial attempt to address the first 2 points above.
I have a tentative patch for the 3rd, but it's nowhere near passing
the self-tests, so it will have to wait a bit.

v2 -> v3:
 - avoid ingremental updates, always recompute sum(ssk->sndbuf) to avoid
   drift on memory pressure/decrease
 - add some needed comments

v1 -> v2:
 - fixed compiler warning in patch 3/3 && more local testing

Paolo Abeni (3):
  mptcp: consolidate sockopt synchronization
  mptcp: ignore notsent_lowat setting at the subflow level.
  mptcp: refactor sndbuf auto-tuning.

 net/mptcp/protocol.c | 21 +++++++++++++----
 net/mptcp/protocol.h | 54 ++++++++++++++++++++++++++++++++++++++++----
 net/mptcp/sockopt.c  | 28 +++++------------------
 net/mptcp/subflow.c  | 21 ++++++++---------
 4 files changed, 82 insertions(+), 42 deletions(-)

-- 
2.41.0